thank you, I am feeling less stressed about raising the chlorine level. Between last night and tonight I raised my chlorine level to 9.5. By looking at the best guess chart I see I can bring level up to 20. I have the polyquat ready to go, but my pump is a cartridge filter and it has no recirculate option. Instead of running the pump, can I run my pool rover?, its self propelled and will aerate the water while it vacuums. Is this an option? They way I understand the best guess chart, 5-10 should be my chlorine levels, up to 20 is shock level. I want you folks to know how much you are appreciated. Thank you again. YvonneSEU